kbuild: Fix trailing whitespaces

Trivial fix.

Signed-off-by: Michal Simek <michal.simek@xilinx.com>

Makefile

@@ -285,7 +285,7 @@ export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
 #         cmd_cc_o_c       = $(CC) $(c_flags) -c -o $@ $<
 #
 # If $(quiet) is empty, the whole command will be printed.
-# If it is set to "quiet_", only the short version will be printed. 
+# If it is set to "quiet_", only the short version will be printed.
 # If it is set to "silent_", nothing will be printed at all, since
 # the variable $(silent_cmd_cc_o_c) doesn't exist.
 #
@@ -998,7 +998,7 @@ ifeq ($(CONFIG_KALLSYMS),y)
 	$(call cmd,u-boot__) common/system_map.o
 endif
 
-# The actual objects are generated when descending, 
+# The actual objects are generated when descending,
 # make sure no implicit rule kicks in
 $(sort $(u-boot-init) $(u-boot-main)): $(u-boot-dirs) ;
 
@@ -1437,7 +1437,7 @@ endif
 	$(build)=$(build-dir) $(@:.ko=.o)
 	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
 
-# FIXME Should go into a make.lib or something 
+# FIXME Should go into a make.lib or something
 # ===========================================================================
 
 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN   $(wildcard $(rm-dirs)))